nfs-idmap : It translates user and group ids into names, and to translate user and group names into ids

Important Configuration Files

/etc/exports : It is the main configuration file, controls which file systems are exported to remote hosts and specifies options.

/etc/fstab : This file is used to control what file systems including NFS directories are mounted when the system boots.

/etc/sysconfig/nfs : This file is used to control which ports the required RPC services run on.

/etc/hosts.allow, and /etc/hosts.deny : These files are called TCP wrappers, controls the access to NFS server. It is used by NFS to decide whether or not to accept a connection coming in from another IP address